right now UE has the RacerX Knucklehead shock towers half off - $35 for 2, and i believe they're 7075 aluminum. i ordered a set last week because of the price. don't throw out the powerstroke idea - they're great shocks!
here's a link to the knuckleheads:
http://www.unlimitedengineering.com/...ore/10102.html